[nss_nonlocal.git] / nonlocal-group.c

/*
 * nonlocal-group.c
 * group database for nss_nonlocal proxy
 *
 * Copyright © 2007 Anders Kaseorg <andersk@mit.edu> and Tim Abbott
 * <tabbott@mit.edu>
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#define _GNU_SOURCE
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <dlfcn.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <grp.h>
#include <nss.h>
#include "nsswitch-internal.h"
#include "nonlocal.h"

#define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"
#define MAGIC_LOCAL_GROUPNAME "nss-local-users"


enum nss_status
_nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
			 char *buffer, size_t buflen, int *errnop);

enum nss_status
_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
			 char *buffer, size_t buflen, int *errnop);


static service_user *
nss_group_nonlocal_database(void)
{
    static service_user *nip = NULL;
    if (nip == NULL)
	__nss_database_lookup("group_nonlocal", NULL, "", &nip);

    return nip;
}


enum nss_status
check_nonlocal_gid(const char *user, gid_t gid, int *errnop)
{
    static const char *fct_name = "getgrgid_r";
    static service_user *startp = NULL;
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(gid_t gid, struct group *grp,
			     char *buffer, size_t buflen, int *errnop);
	void *ptr;
    } fct;
    struct group gbuf;
    int old_errno = errno;

    int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
    char *buf = malloc(buflen);
    if (buf == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }

    if (fct_start == NULL &&
	__nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
	free(buf);
	return NSS_STATUS_UNAVAIL;
    }
    nip = startp;
    fct.ptr = fct_start;
    do {
	if (fct.l == _nss_nonlocal_getgrgid_r)
	    status = NSS_STATUS_NOTFOUND;
	else
	    status = DL_CALL_FCT(fct.l, (gid, &gbuf, buf, buflen, errnop));
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);

    if (status == NSS_STATUS_SUCCESS) {
	syslog(LOG_WARNING, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
	status = NSS_STATUS_NOTFOUND;
    } else if (status != NSS_STATUS_TRYAGAIN) {
	status = NSS_STATUS_SUCCESS;
    }

    free(buf);
    return status;
}

enum nss_status
get_local_group(const char *name, struct group *grp, char *buffer, size_t buflen, int *errnop)
{
    static const char *fct_name = "getgrnam_r";
    static service_user *startp = NULL;
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(const char *name, struct group *grp,
			     char *buffer, size_t buflen, int *errnop);
	void *ptr;
    } fct;
    struct group gbuf;
    int n;
    int old_errno = errno;

    int len = sysconf(_SC_GETGR_R_SIZE_MAX);
    char *buf = malloc(len);
    if (buf == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }

    if (fct_start == NULL &&
	__nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
	free(buf);
	return NSS_STATUS_UNAVAIL;
    }
    nip = startp;
    fct.ptr = fct_start;
    do {
	if (fct.l == _nss_nonlocal_getgrnam_r)
	    status = NSS_STATUS_NOTFOUND;
	else
	    status = DL_CALL_FCT(fct.l, (name, &gbuf, buf, buflen, errnop));
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);

    if (status != NSS_STATUS_SUCCESS)
	goto get_local_group_done;

    n = snprintf(buffer, buflen, "%s", gbuf.gr_name);
    if (n < 0 || n >= buflen) {
	*errnop = ERANGE;
	status = NSS_STATUS_TRYAGAIN;
	goto get_local_group_done;
    }
    grp->gr_name = buffer;
    buffer += n;
    buflen -= n;

    n = snprintf(buffer, buflen, "%s", gbuf.gr_passwd);
    if (n < 0 || n >= buflen) {
	*errnop = ERANGE;
	status = NSS_STATUS_TRYAGAIN;
	goto get_local_group_done;
    }
    grp->gr_passwd = buffer;
    buffer += n;
    buflen -= n;

    grp->gr_gid = gbuf.gr_gid;

    if (buflen < sizeof(void *)) {
	*errnop = ERANGE;
	status = NSS_STATUS_TRYAGAIN;
	goto get_local_group_done;
    }
    *(void **)buffer = NULL;
    buffer += sizeof(void *);
    buflen -= sizeof(void *);

 get_local_group_done:
    free(buf);
    return status;
}

static service_user *grent_nip = NULL;
static void *grent_fct_start;
static union {
    enum nss_status (*l)(struct group *grp, char *buffer, size_t buflen,
			 int *errnop);
    void *ptr;
} grent_fct;
static const char *grent_fct_name = "getgrent_r";

enum nss_status
_nss_nonlocal_setgrent(int stayopen)
{
    static const char *fct_name = "setgrent";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(int stayopen);
	void *ptr;
    } fct;

    nip = nss_group_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (stayopen));
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    grent_nip = nip;
    if (grent_fct_start == NULL)
	grent_fct_start = __nss_lookup_function(nip, grent_fct_name);
    grent_fct.ptr = grent_fct_start;
    return NSS_STATUS_SUCCESS;
}

enum nss_status
_nss_nonlocal_endgrent(void)
{
    static const char *fct_name = "endgrent";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(void);
	void *ptr;
    } fct;

    grent_nip = NULL;

    nip = nss_group_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, ());
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    return status;
}

enum nss_status
_nss_nonlocal_getgrent_r(struct group *grp, char *buffer, size_t buflen,
			 int *errnop)
{
    enum nss_status status;

    char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
	return NSS_STATUS_UNAVAIL;

    if (grent_nip == NULL) {
	status = _nss_nonlocal_setgrent(0);
	if (status != NSS_STATUS_SUCCESS)
	    return status;
    }
    do {
	if (grent_fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else {
	    int nonlocal_errno;
	    do
		status = DL_CALL_FCT(grent_fct.l, (grp, buffer, buflen, errnop));
	    while (status == NSS_STATUS_SUCCESS &&
		   check_nonlocal_gid("(unknown)", grp->gr_gid, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	}
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    return status;

	if (status == NSS_STATUS_SUCCESS)
	    return NSS_STATUS_SUCCESS;
    } while (__nss_next(&grent_nip, grent_fct_name, &grent_fct.ptr, status, 0) == 0);

    grent_nip = NULL;
    return NSS_STATUS_NOTFOUND;
}


enum nss_status
_nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
			 char *buffer, size_t buflen, int *errnop)
{
    static const char *fct_name = "getgrnam_r";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(const char *name, struct group *grp,
			     char *buffer, size_t buflen, int *errnop);
	void *ptr;
    } fct;

    char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
	return NSS_STATUS_UNAVAIL;

    nip = nss_group_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (name, grp, buffer, buflen, errnop));
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    return check_nonlocal_gid(name, grp->gr_gid, errnop);
}

enum nss_status
_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
			 char *buffer, size_t buflen, int *errnop)
{
    static const char *fct_name = "getgrgid_r";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(gid_t gid, struct group *grp,
			     char *buffer, size_t buflen, int *errnop);
	void *ptr;
    } fct;

    char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
    if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
	return NSS_STATUS_UNAVAIL;

    nip = nss_group_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;
    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (gid, grp, buffer, buflen, errnop));
	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	    break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
	return status;

    return check_nonlocal_gid(grp->gr_name, grp->gr_gid, errnop);
}

enum nss_status
_nss_nonlocal_initgroups_dyn(const char *user, gid_t group, long int *start,
			     long int *size, gid_t **groupsp, long int limit,
			     int *errnop)
{
    static const char *fct_name = "initgroups_dyn";
    static void *fct_start = NULL;
    enum nss_status status;
    service_user *nip;
    union {
	enum nss_status (*l)(const char *user, gid_t group, long int *start,
			     long int *size, gid_t **groupsp, long int limit,
			     int *errnop);
	void *ptr;
    } fct;

    struct group local_users_group, nonlocal_users_group;
    gid_t local_users_gid, gid;
    int is_local = 0;
    int buflen;
    char *buffer;

    /* Check that the user is a nonlocal user before adding any groups. */
    status = check_nonlocal_user(user, errnop);
    if (status == NSS_STATUS_TRYAGAIN)
	return status;
    else if (status != NSS_STATUS_SUCCESS)
	is_local = 1;

    int old_errno = errno;

    buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
    buffer = malloc(buflen);
    if (buffer == NULL) {
	*errnop = ENOMEM;
	errno = old_errno;
	return NSS_STATUS_TRYAGAIN;
    }
    status = get_local_group(MAGIC_LOCAL_GROUPNAME,
			     &local_users_group, buffer, buflen, errnop);
    if (status == NSS_STATUS_SUCCESS) {
	local_users_gid = local_users_group.gr_gid;
    } else if (status == NSS_STATUS_TRYAGAIN) {
	free(buffer);
	return status;
    } else {
	syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
	       MAGIC_LOCAL_GROUPNAME);
	local_users_gid = -1;
    }
    free(buffer);

    if (is_local) {
	gid = local_users_gid;
    } else {
	buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
	buffer = malloc(buflen);
	if (buffer == NULL) {
	    *errnop = ENOMEM;
	    errno = old_errno;
	    return NSS_STATUS_TRYAGAIN;
	}
 	status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
				 &nonlocal_users_group, buffer, buflen, errnop);
	if (status == NSS_STATUS_SUCCESS) {
	    gid = nonlocal_users_group.gr_gid;
	} else if (status == NSS_STATUS_TRYAGAIN) {
	    free(buffer);
	    return status;
	} else {
	    syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
		   MAGIC_NONLOCAL_GROUPNAME);
	    gid = -1;
	}
	free(buffer);
    }

    if (gid != -1) {
	int i;
	for (i = 0; i < *start; ++i)
	    if ((*groupsp)[i] == gid)
		break;
	if (i >= *start) {
	    if (*start + 1 > *size) {
		gid_t *newgroups;
		long int newsize = 2 * *size;
		if (limit > 0) {
		    if (*size >= limit)
			return NSS_STATUS_SUCCESS;
		    if (newsize > limit)
			newsize = limit;
		}
		newgroups = realloc(*groupsp, *size * sizeof((*groupsp)[0]));
		if (newgroups == NULL) {
		    *errnop = ENOMEM;
		    errno = old_errno;
		    return NSS_STATUS_TRYAGAIN;
		}
		*groupsp = newgroups;
		*size = newsize;
	    }
	    (*groupsp)[(*start)++] = gid;
	}
    }

    if (is_local)
	return NSS_STATUS_SUCCESS;

    int in = *start, out = *start, i;

    nip = nss_group_nonlocal_database();
    if (nip == NULL)
	return NSS_STATUS_UNAVAIL;
    if (fct_start == NULL)
	fct_start = __nss_lookup_function(nip, fct_name);
    fct.ptr = fct_start;

    do {
	if (fct.ptr == NULL)
	    status = NSS_STATUS_UNAVAIL;
	else
	    status = DL_CALL_FCT(fct.l, (user, group, start, size, groupsp, limit, errnop));
        if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
            break;
    } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
    if (status != NSS_STATUS_SUCCESS)
        return status;

    for (; in < *start; ++in) {
	int nonlocal_errno = *errnop;

	for (i = 0; i < out; ++i)
	    if ((*groupsp)[i] == (*groupsp)[in])
		break;
	if (i < out)
	    continue;

	/* Don't let users get into MAGIC_LOCAL_GROUPNAME from nonlocal reasons. */
	if (local_users_gid == (*groupsp)[in]) {
	    syslog(LOG_WARNING, "nss_nonlocal: Nonlocal user %s removed from special local users group %s",
		   user, MAGIC_LOCAL_GROUPNAME);
	    continue;
	}

	status = check_nonlocal_gid(user, (*groupsp)[in], &nonlocal_errno);
	if (status == NSS_STATUS_SUCCESS) {
	    (*groupsp)[out++] = (*groupsp)[in];
	} else if (status == NSS_STATUS_TRYAGAIN) {
	    *start = out;
	    *errnop = nonlocal_errno;
	    return status;
	}
    }

    *start = out;
    return NSS_STATUS_SUCCESS;
}
Commit	Line	Data
f6903667 AK	1	/*
	2	* nonlocal-group.c
	3	* group database for nss_nonlocal proxy
	4	*
48479fc7 TA	5	* Copyright © 2007 Anders Kaseorg <andersk@mit.edu> and Tim Abbott
48479fc7 TA	6	* <tabbott@mit.edu>
f6903667 AK	7	*
	8	* Permission is hereby granted, free of charge, to any person
	9	* obtaining a copy of this software and associated documentation
	10	* files (the "Software"), to deal in the Software without
	11	* restriction, including without limitation the rights to use, copy,
	12	* modify, merge, publish, distribute, sublicense, and/or sell copies
	13	* of the Software, and to permit persons to whom the Software is
	14	* furnished to do so, subject to the following conditions:
	15	*
	16	* The above copyright notice and this permission notice shall be
	17	* included in all copies or substantial portions of the Software.
	18	*
	19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	20	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	21	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	22	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	23	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	24	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	25	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	26	* SOFTWARE.
	27	*/
	28
	29	#define _GNU_SOURCE
	30	#include <sys/types.h>
	31	#include <unistd.h>
	32	#include <stdlib.h>
	33	#include <stdint.h>
	34	#include <string.h>
	35	#include <dlfcn.h>
	36	#include <stdio.h>
	37	#include <syslog.h>
	38	#include <errno.h>
	39	#include <grp.h>
	40	#include <nss.h>
	41	#include "nsswitch-internal.h"
	42	#include "nonlocal.h"
	43
48479fc7 TA	44	#define MAGIC_NONLOCAL_GROUPNAME "nss-nonlocal-users"
48479fc7 TA	45	#define MAGIC_LOCAL_GROUPNAME "nss-local-users"
f7293a54	46
f6903667	47
c1812233 AK	48	enum nss_status
	49	_nss_nonlocal_getgrnam_r(const char name, struct group grp,
	50	char buffer, size_t buflen, int errnop);
	51
	52	enum nss_status
	53	_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
	54	char buffer, size_t buflen, int errnop);
	55
	56
f6903667 AK	57	static service_user *
	58	nss_group_nonlocal_database(void)
	59	{
	60	static service_user *nip = NULL;
	61	if (nip == NULL)
	62	__nss_database_lookup("group_nonlocal", NULL, "", &nip);
48479fc7	63
f6903667 AK	64	return nip;
	65	}
	66
	67
f6903667 AK	68	enum nss_status
	69	check_nonlocal_gid(const char user, gid_t gid, int errnop)
	70	{
30fb3957 AK	71	static const char *fct_name = "getgrgid_r";
	72	static service_user *startp = NULL;
	73	static void *fct_start = NULL;
	74	enum nss_status status;
	75	service_user *nip;
	76	union {
	77	enum nss_status (l)(gid_t gid, struct group grp,
	78	char buffer, size_t buflen, int errnop);
	79	void *ptr;
	80	} fct;
f7293a54	81	struct group gbuf;
f7293a54	82	int old_errno = errno;
c1812233 AK	83
c1812233 AK	84	int buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
f7293a54 AK	85	char *buf = malloc(buflen);
f7293a54 AK	86	if (buf == NULL) {
f6903667	87	*errnop = ENOMEM;
f7293a54	88	errno = old_errno;
f6903667 AK	89	return NSS_STATUS_TRYAGAIN;
f6903667 AK	90	}
30fb3957 AK	91
	92	if (fct_start == NULL &&
	93	__nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
	94	free(buf);
	95	return NSS_STATUS_UNAVAIL;
	96	}
	97	nip = startp;
	98	fct.ptr = fct_start;
	99	do {
c1812233 AK	100	if (fct.l == _nss_nonlocal_getgrgid_r)
	101	status = NSS_STATUS_NOTFOUND;
	102	else
	103	status = DL_CALL_FCT(fct.l, (gid, &gbuf, buf, buflen, errnop));
30fb3957 AK	104	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	105	break;
	106	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	107
	108	if (status == NSS_STATUS_SUCCESS) {
f7293a54	109	syslog(LOG_WARNING, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
f6903667	110	status = NSS_STATUS_NOTFOUND;
30fb3957 AK	111	} else if (status != NSS_STATUS_TRYAGAIN) {
30fb3957 AK	112	status = NSS_STATUS_SUCCESS;
f6903667	113	}
30fb3957	114
f7293a54	115	free(buf);
f6903667 AK	116	return status;
	117	}
	118
48479fc7 TA	119	enum nss_status
	120	get_local_group(const char name, struct group grp, char buffer, size_t buflen, int errnop)
	121	{
30fb3957 AK	122	static const char *fct_name = "getgrnam_r";
	123	static service_user *startp = NULL;
	124	static void *fct_start = NULL;
	125	enum nss_status status;
	126	service_user *nip;
	127	union {
	128	enum nss_status (l)(const char name, struct group *grp,
	129	char buffer, size_t buflen, int errnop);
	130	void *ptr;
	131	} fct;
48479fc7	132	struct group gbuf;
30fb3957	133	int n;
48479fc7	134	int old_errno = errno;
c1812233 AK	135
c1812233 AK	136	int len = sysconf(_SC_GETGR_R_SIZE_MAX);
48479fc7 TA	137	char *buf = malloc(len);
	138	if (buf == NULL) {
	139	*errnop = ENOMEM;
	140	errno = old_errno;
	141	return NSS_STATUS_TRYAGAIN;
	142	}
1e78305d	143
30fb3957 AK	144	if (fct_start == NULL &&
	145	__nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
	146	free(buf);
	147	return NSS_STATUS_UNAVAIL;
	148	}
	149	nip = startp;
	150	fct.ptr = fct_start;
	151	do {
c1812233 AK	152	if (fct.l == _nss_nonlocal_getgrnam_r)
	153	status = NSS_STATUS_NOTFOUND;
	154	else
	155	status = DL_CALL_FCT(fct.l, (name, &gbuf, buf, buflen, errnop));
30fb3957 AK	156	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	157	break;
	158	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	159
f943c4ed AK	160	if (status != NSS_STATUS_SUCCESS)
	161	goto get_local_group_done;
	162
	163	n = snprintf(buffer, buflen, "%s", gbuf.gr_name);
	164	if (n < 0 \|\| n >= buflen) {
	165	*errnop = ERANGE;
	166	status = NSS_STATUS_TRYAGAIN;
	167	goto get_local_group_done;
	168	}
	169	grp->gr_name = buffer;
	170	buffer += n;
	171	buflen -= n;
	172
	173	n = snprintf(buffer, buflen, "%s", gbuf.gr_passwd);
	174	if (n < 0 \|\| n >= buflen) {
	175	*errnop = ERANGE;
	176	status = NSS_STATUS_TRYAGAIN;
	177	goto get_local_group_done;
	178	}
	179	grp->gr_passwd = buffer;
	180	buffer += n;
	181	buflen -= n;
	182
	183	grp->gr_gid = gbuf.gr_gid;
	184
	185	if (buflen < sizeof(void *)) {
	186	*errnop = ERANGE;
	187	status = NSS_STATUS_TRYAGAIN;
	188	goto get_local_group_done;
48479fc7	189	}
f943c4ed AK	190	(void *)buffer = NULL;
	191	buffer += sizeof(void *);
	192	buflen -= sizeof(void *);
30fb3957	193
1e78305d	194	get_local_group_done:
48479fc7	195	free(buf);
48479fc7 TA	196	return status;
48479fc7 TA	197	}
f6903667 AK	198
	199	static service_user *grent_nip = NULL;
	200	static void *grent_fct_start;
	201	static union {
	202	enum nss_status (l)(struct group grp, char *buffer, size_t buflen,
	203	int *errnop);
	204	void *ptr;
	205	} grent_fct;
	206	static const char *grent_fct_name = "getgrent_r";
	207
	208	enum nss_status
	209	_nss_nonlocal_setgrent(int stayopen)
	210	{
	211	static const char *fct_name = "setgrent";
	212	static void *fct_start = NULL;
	213	enum nss_status status;
	214	service_user *nip;
	215	union {
	216	enum nss_status (*l)(int stayopen);
	217	void *ptr;
	218	} fct;
	219
	220	nip = nss_group_nonlocal_database();
	221	if (nip == NULL)
	222	return NSS_STATUS_UNAVAIL;
	223	if (fct_start == NULL)
	224	fct_start = __nss_lookup_function(nip, fct_name);
	225	fct.ptr = fct_start;
	226	do {
	227	if (fct.ptr == NULL)
	228	status = NSS_STATUS_UNAVAIL;
	229	else
	230	status = DL_CALL_FCT(fct.l, (stayopen));
	231	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	232	if (status != NSS_STATUS_SUCCESS)
	233	return status;
	234
	235	grent_nip = nip;
	236	if (grent_fct_start == NULL)
	237	grent_fct_start = __nss_lookup_function(nip, grent_fct_name);
	238	grent_fct.ptr = grent_fct_start;
	239	return NSS_STATUS_SUCCESS;
	240	}
	241
	242	enum nss_status
	243	_nss_nonlocal_endgrent(void)
	244	{
	245	static const char *fct_name = "endgrent";
	246	static void *fct_start = NULL;
	247	enum nss_status status;
	248	service_user *nip;
	249	union {
	250	enum nss_status (*l)(void);
	251	void *ptr;
	252	} fct;
	253
	254	grent_nip = NULL;
	255
	256	nip = nss_group_nonlocal_database();
	257	if (nip == NULL)
	258	return NSS_STATUS_UNAVAIL;
	259	if (fct_start == NULL)
	260	fct_start = __nss_lookup_function(nip, fct_name);
	261	fct.ptr = fct_start;
262	do {
263	if (fct.ptr == NULL)
264	status = NSS_STATUS_UNAVAIL;
265	else
266	status = DL_CALL_FCT(fct.l, ());
267	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
268	return status;
269	}
270
271	enum nss_status
272	_nss_nonlocal_getgrent_r(struct group grp, char buffer, size_t buflen,
273	int *errnop)
274	{
275	enum nss_status status;
a360549e TA	276
a360549e TA	277	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	278	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
a360549e TA	279	return NSS_STATUS_UNAVAIL;
a360549e TA	280
f6903667 AK	281	if (grent_nip == NULL) {
	282	status = _nss_nonlocal_setgrent(0);
	283	if (status != NSS_STATUS_SUCCESS)
	284	return status;
	285	}
	286	do {
	287	if (grent_fct.ptr == NULL)
	288	status = NSS_STATUS_UNAVAIL;
	289	else {
	290	int nonlocal_errno;
	291	do
	292	status = DL_CALL_FCT(grent_fct.l, (grp, buffer, buflen, errnop));
	293	while (status == NSS_STATUS_SUCCESS &&
	294	check_nonlocal_gid("(unknown)", grp->gr_gid, &nonlocal_errno) != NSS_STATUS_SUCCESS);
	295	}
	296	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	297	return status;
	298
	299	if (status == NSS_STATUS_SUCCESS)
	300	return NSS_STATUS_SUCCESS;
	301	} while (__nss_next(&grent_nip, grent_fct_name, &grent_fct.ptr, status, 0) == 0);
	302
	303	grent_nip = NULL;
	304	return NSS_STATUS_NOTFOUND;
	305	}
	306
	307
	308	enum nss_status
	309	_nss_nonlocal_getgrnam_r(const char name, struct group grp,
	310	char buffer, size_t buflen, int errnop)
	311	{
	312	static const char *fct_name = "getgrnam_r";
	313	static void *fct_start = NULL;
	314	enum nss_status status;
	315	service_user *nip;
	316	union {
	317	enum nss_status (l)(const char name, struct group *grp,
	318	char buffer, size_t buflen, int errnop);
	319	void *ptr;
	320	} fct;
	321
a360549e	322	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	323	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
48479fc7 TA	324	return NSS_STATUS_UNAVAIL;
48479fc7 TA	325
f6903667 AK	326	nip = nss_group_nonlocal_database();
	327	if (nip == NULL)
	328	return NSS_STATUS_UNAVAIL;
	329	if (fct_start == NULL)
	330	fct_start = __nss_lookup_function(nip, fct_name);
	331	fct.ptr = fct_start;
	332	do {
	333	if (fct.ptr == NULL)
	334	status = NSS_STATUS_UNAVAIL;
	335	else
	336	status = DL_CALL_FCT(fct.l, (name, grp, buffer, buflen, errnop));
	337	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	338	break;
	339	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	340	if (status != NSS_STATUS_SUCCESS)
	341	return status;
	342
	343	return check_nonlocal_gid(name, grp->gr_gid, errnop);
	344	}
	345
	346	enum nss_status
	347	_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
	348	char buffer, size_t buflen, int errnop)
	349	{
	350	static const char *fct_name = "getgrgid_r";
	351	static void *fct_start = NULL;
	352	enum nss_status status;
	353	service_user *nip;
	354	union {
	355	enum nss_status (l)(gid_t gid, struct group grp,
	356	char buffer, size_t buflen, int errnop);
	357	void *ptr;
	358	} fct;
	359
a360549e	360	char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
c1812233	361	if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
f6903667 AK	362	return NSS_STATUS_UNAVAIL;
	363
	364	nip = nss_group_nonlocal_database();
	365	if (nip == NULL)
	366	return NSS_STATUS_UNAVAIL;
	367	if (fct_start == NULL)
	368	fct_start = __nss_lookup_function(nip, fct_name);
	369	fct.ptr = fct_start;
	370	do {
	371	if (fct.ptr == NULL)
	372	status = NSS_STATUS_UNAVAIL;
	373	else
	374	status = DL_CALL_FCT(fct.l, (gid, grp, buffer, buflen, errnop));
	375	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	376	break;
	377	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	378	if (status != NSS_STATUS_SUCCESS)
	379	return status;
	380
	381	return check_nonlocal_gid(grp->gr_name, grp->gr_gid, errnop);
	382	}
	383
	384	enum nss_status
	385	_nss_nonlocal_initgroups_dyn(const char user, gid_t group, long int start,
	386	long int size, gid_t *groupsp, long int limit,
	387	int *errnop)
	388	{
	389	static const char *fct_name = "initgroups_dyn";
	390	static void *fct_start = NULL;
	391	enum nss_status status;
	392	service_user *nip;
	393	union {
	394	enum nss_status (l)(const char user, gid_t group, long int *start,
	395	long int size, gid_t *groupsp, long int limit,
	396	int *errnop);
	397	void *ptr;
	398	} fct;
1e78305d AK	399
	400	struct group local_users_group, nonlocal_users_group;
	401	gid_t local_users_gid, gid;
48479fc7	402	int is_local = 0;
1e78305d AK	403	int buflen;
1e78305d AK	404	char *buffer;
48479fc7	405
1e78305d	406	/* Check that the user is a nonlocal user before adding any groups. */
48479fc7	407	status = check_nonlocal_user(user, errnop);
5879a696	408	if (status == NSS_STATUS_TRYAGAIN)
48479fc7	409	return status;
5879a696 AK	410	else if (status != NSS_STATUS_SUCCESS)
5879a696 AK	411	is_local = 1;
48479fc7	412
1e78305d AK	413	int old_errno = errno;
	414
	415	buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
	416	buffer = malloc(buflen);
48479fc7 TA	417	if (buffer == NULL) {
48479fc7 TA	418	*errnop = ENOMEM;
1e78305d	419	errno = old_errno;
48479fc7 TA	420	return NSS_STATUS_TRYAGAIN;
48479fc7 TA	421	}
48479fc7 TA	422	status = get_local_group(MAGIC_LOCAL_GROUPNAME,
48479fc7 TA	423	&local_users_group, buffer, buflen, errnop);
5879a696 AK	424	if (status == NSS_STATUS_SUCCESS) {
	425	local_users_gid = local_users_group.gr_gid;
	426	} else if (status == NSS_STATUS_TRYAGAIN) {
dc94c928	427	free(buffer);
5879a696 AK	428	return status;
5879a696 AK	429	} else {
48479fc7 TA	430	syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
48479fc7 TA	431	MAGIC_LOCAL_GROUPNAME);
1e78305d	432	local_users_gid = -1;
5879a696	433	}
1e78305d AK	434	free(buffer);
	435
	436	if (is_local) {
	437	gid = local_users_gid;
	438	} else {
	439	buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
	440	buffer = malloc(buflen);
	441	if (buffer == NULL) {
	442	*errnop = ENOMEM;
	443	errno = old_errno;
	444	return NSS_STATUS_TRYAGAIN;
48479fc7	445	}
1e78305d AK	446	status = get_local_group(MAGIC_NONLOCAL_GROUPNAME,
1e78305d AK	447	&nonlocal_users_group, buffer, buflen, errnop);
5879a696 AK	448	if (status == NSS_STATUS_SUCCESS) {
	449	gid = nonlocal_users_group.gr_gid;
	450	} else if (status == NSS_STATUS_TRYAGAIN) {
dc94c928	451	free(buffer);
5879a696 AK	452	return status;
5879a696 AK	453	} else {
1e78305d AK	454	syslog(LOG_WARNING, "nss_nonlocal: Group %s does not exist locally!",
	455	MAGIC_NONLOCAL_GROUPNAME);
	456	gid = -1;
5879a696	457	}
1e78305d	458	free(buffer);
48479fc7	459	}
1e78305d AK	460
	461	if (gid != -1) {
	462	int i;
	463	for (i = 0; i < *start; ++i)
	464	if ((*groupsp)[i] == gid)
	465	break;
	466	if (i >= *start) {
	467	if (start + 1 > size) {
	468	gid_t *newgroups;
	469	long int newsize = 2 * *size;
	470	if (limit > 0) {
	471	if (*size >= limit)
	472	return NSS_STATUS_SUCCESS;
	473	if (newsize > limit)
	474	newsize = limit;
	475	}
	476	newgroups = realloc(groupsp, size * sizeof((*groupsp)[0]));
	477	if (newgroups == NULL) {
	478	*errnop = ENOMEM;
	479	errno = old_errno;
	480	return NSS_STATUS_TRYAGAIN;
	481	}
	482	*groupsp = newgroups;
	483	*size = newsize;
	484	}
	485	(groupsp)[(start)++] = gid;
	486	}
48479fc7	487	}
f6903667	488
1e78305d AK	489	if (is_local)
	490	return NSS_STATUS_SUCCESS;
	491
	492	int in = start, out = start, i;
	493
f6903667 AK	494	nip = nss_group_nonlocal_database();
	495	if (nip == NULL)
	496	return NSS_STATUS_UNAVAIL;
	497	if (fct_start == NULL)
	498	fct_start = __nss_lookup_function(nip, fct_name);
	499	fct.ptr = fct_start;
	500
	501	do {
	502	if (fct.ptr == NULL)
	503	status = NSS_STATUS_UNAVAIL;
	504	else
	505	status = DL_CALL_FCT(fct.l, (user, group, start, size, groupsp, limit, errnop));
	506	if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
	507	break;
	508	} while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
	509	if (status != NSS_STATUS_SUCCESS)
	510	return status;
	511
	512	for (; in < *start; ++in) {
	513	int nonlocal_errno = *errnop;
	514
	515	for (i = 0; i < out; ++i)
	516	if ((groupsp)[i] == (groupsp)[in])
	517	break;
	518	if (i < out)
	519	continue;
	520
1e78305d AK	521	/* Don't let users get into MAGIC_LOCAL_GROUPNAME from nonlocal reasons. */
	522	if (local_users_gid == (*groupsp)[in]) {
	523	syslog(LOG_WARNING, "nss_nonlocal: Nonlocal user %s removed from special local users group %s",
	524	user, MAGIC_LOCAL_GROUPNAME);
	525	continue;
	526	}
	527
f6903667 AK	528	status = check_nonlocal_gid(user, (*groupsp)[in], &nonlocal_errno);
f6903667 AK	529	if (status == NSS_STATUS_SUCCESS) {
1e78305d	530	(groupsp)[out++] = (groupsp)[in];
5879a696	531	} else if (status == NSS_STATUS_TRYAGAIN) {
f6903667 AK	532	*start = out;
	533	*errnop = nonlocal_errno;
	534	return status;
	535	}
	536	}
	537
	538	*start = out;
	539	return NSS_STATUS_SUCCESS;
	540	}